同轴馈线额定平均功率研究

Research on Rated Average Power of Coaxial Feeder

同轴电缆广泛应用于广播电视天馈线系统,对保证广播电视信号传输的质量和可靠性有着至关重要的作用。本文对常用的同轴硬馈及软馈电缆的内导体温升与平均功率的关系进行了深入研究,通过热仿真得出了常规使用条件下的额定平均功率容量。提出了通过增加馈管内外导体间空气流动的方法提高馈线平均功率容量,仿真结果表明,此办法可以明显提高软馈的额定功率容量,并且通过控制通风流速可以调整额定功率的大小。

Coaxial cable is widely used in radio and television antenna feeder system, which plays an important role in ensuring quality and reliability of radio and television signal transmission. In this paper, the relationship between temperature rise and average power of internal conductor of commonly used coaxial rigid lines and air dielectric cables is deeply studied, and rated average power capacity under normal use conditions is obtained through thermal simulation. The method of increasing air flow between inner and outer conductors of the cables is proposed to improve average power capacity of the cables. Simulation results show that this method can significantly improve rated power capacity of air dielectric cables, and rated power can be adjusted by controlling ventilation flow rate.